Unless you need really long samples - like a full song as a track - you shouldn't have a problem. 3 minutes of samples is a fairly long time! And obvioujsly you can split up sounds among the presets, I think there are 8. So you could conceivably load up to 40 sounds. All things considered, you really get a lot for $200.

If you need more ram and additional flexibility, you can get the Roland SPD-SX. It has 2gb ram, handles stereo samples, has 9 pads + 4 trigger/pedal inputs, and is $799. That's what I use on tour.